Line Loss Analysis and Reduction Method for Small Hydropower Embedded Distribution Network

2019 ◽  
pp. 1043-1054
Author(s):  
BoJian Chen
Keyword(s):  
Reduction Method ◽  
Distribution Network ◽  
Small Hydropower ◽  
Loss Analysis ◽  
Line Loss

scholarly journals Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation

Processes ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 328 ◽  
Author(s):  
Zifan Zhang ◽  
Zhidong Wang ◽  
Zhifeng Chen ◽  
Gan Wang ◽  
Na Shen ◽  
...  
Keyword(s):  
Power Systems ◽  
Computer Aided Design ◽  
Distribution Network ◽  
Reducing Power ◽  
Distribution Networks ◽  
Open Loop ◽  
Frequency Characteristics ◽  
Utilization Efficiency ◽  
Small Hydropower ◽  
Tie Line

As the largest global renewable source, hydropower is a useful supplement to mountainous distribution networks with abundant water resources, and shoulders a large portion of the regulation duty in many power systems. In particular, in the form of decentralized energy sources located to their customers, small hydropower (SHP) improve grid stability by diversifying the electricity system and reducing power loss. The mountainous distribution networks supplied by small hydropower are closed-loop design but open-loop operation, which easily causes the tripping of tie line even further the off-grid operation of small hydropower system. Once the tie line trips, the current countermeasures—such as hydropower shutdown and load shedding—do not fully guarantee the reliability of power supply and the utilization efficiency of hydropower. This paper studies the amplitude-frequency characteristics of SHP off-grid, according to the typical integration of hydropower in South China, a SHP on-grid/off-grid model is established based on the Power Systems Computer Aided Design (PSCAD) platform. It is found that due to the inertia of SHP, the amplitude-frequency characteristics of SHP island system are relatively slow, and the process of non-synchronization with the main grid is gradually expanded. The characteristic of SHP has a certain degree of synchronization with the main grid in the initial island operates stage, which helps to find a novel grid connection method. This paper further proposes the strategy of using fast busbar automatic transfer switch (BATS), which quickly connect the trip-off SHP to the distribution network under the condition of permitting distributed energy grid-connected. The PSCAD simulation results show that proposed strategy has a limited impact on the power grid and prove the effectiveness of the method.

scholarly journals Research on the Device Design for Calculation Distribution Line Loss Based on Dynamic Three-phase Unbalance Degree

2019 ◽  
Vol 118 ◽  
pp. 02071
Author(s):  
Meifang Wei ◽  
Jing Yang ◽  
Xuhua Zeng ◽  
Haiyan Wu ◽  
Di Huang
Keyword(s):  
Real Time ◽  
Distribution Network ◽  
Wireless Transmission ◽  
Loss Calculation ◽  
Sequence Identification ◽  
Phase Sequence ◽  
Three Phase ◽  
Time Calculation ◽  
Distribution Line ◽  
Line Loss

For the power distribution network line loss calculation, there are some problems, such as backward method, long calculation period, large workload and poor real-time performance. To this end, this paper proposes a real-time calculation method for distribution line loss based on dynamic three-phase unbalance, and a hardware device system with unbalanced phase sequence identification function, three-phase unbalance detection function and line loss real-time calculation function has been developed. The system uses a master-slave design based on the principle of wireless transmission. The slave collects standard three-phase current signals and transmits them to the host through wireless transmission. The host is installed on the low voltage side of the transformer in the transformer region, and the current signal of the transformer region is collected in real time. Unbalanced phase sequence identification, unbalance calculation, and line loss calculation based on dynamic unbalance are performed by comparing the current signals collected by the master and the slave. The above algorithm implementation process can be displayed online in real time. In addition to the core data processing and waveform display functions, the device also includes a battery power supply and management system, a signal storage and transmission system, and temperature measurement, and overcurrent and overvoltage protection. The test results of the device show that the device has the characteristics of convenient carrying, fast detection of three-phase unbalance, and accurate calculation of line loss. The device can monitor the running status of the distribution network transformer region in real time.

Analysis on Losses of Distribution Network and Countermeasures to Reduce Losses

2014 ◽  
Vol 960-961 ◽  
pp. 1483-1489
Author(s):  
Qian Wang ◽  
Shang Ji Chen ◽  
Xiao Hui Han
Keyword(s):  
Distribution Network ◽  
Loss Reduction ◽  
Social Significance ◽  
Loss Model ◽  
Planning And Design ◽  
Operation And Maintenance ◽  
Line Loss ◽  
Save Energy ◽  
Current Energy ◽  
Power Configuration

The thesis describes the loss model of distribution network and gives the transformer loss model and line loss model, Then it proposes some loss reduction measures at the stage of planning and design as well as operation and maintenance. Finally, according to the main problems about the loss reduction measures in China, it puts forward some countermeasures to reduce line loss . Distribution network as part of the end for power configuration which is directly connected with the users of demand side. The loss of distribution network has been high because of feeder radius, complex voltage grade and a large number of devices on the network. The line loss of distribution network represents a major component of the line loss in the whole power system, the line loss of 10kv and below distribution network accounts for about 78% in it according to statistical analysis[1-2]. So, under the current energy shortage situation, there is a great economic and social significance to adopt the reasonable measures to save energy and decrease loss in distribution network.

Effect of the PV/FC hybrid power generation system on total line loss in distribution network

2010 ◽  
Author(s):  
Yahya Kabiri Renani ◽  
H. Askarian Abyaneh ◽  
S. H. H. Sadeghi ◽  
H. Hashemi Dezaki ◽  
H. Nafisi ◽  
...  
Keyword(s):  
Power Generation ◽  
Distribution Network ◽  
Generation System ◽  
Hybrid Power ◽  
Power Generation System ◽  
Line Loss
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